Disazo electrophotographic light-sensitive media

Abstract

An electrophotographic light-sensitive medium comprising a light-sensitive layer containing a dis-azo compound represented by Formula (1) ##STR1## wherein A represents a single chemical bond, a divalent hydrocarbon group containing a conjugated double bond, a divalent hydrocarbon group containing a nitrogen atom in a conjugated double bond, or a divalent heterocyclic group which may be condensed with a benzene ring or substituted and forms a conjugated double bond system in combination with the adjacent azomethine groups, and B and B', which may be the same or different, each represents a coupler having aromatic properties.

What is claimed is: 
     
       1. An electrophotographic light-sensitive medium comprising a light-sensitive layer containing a dis-azo compound represented by Formula (1) ##STR60## wherein A is a member selected from the group consisting of a single chemical bond, a divalent hydrocarbon group containing a conjugated double bond, a divalent hydrocarbon group containing a nitrogen atom in a conjugated double bond and a divalent heterocyclic group which may be condensed with a benzene ring or substituted and forms a conjugated double bond system in combination with the adjacent azomethine groups, and B and B', which may be the same or different, each represents a coupler having aromatic properties. 
     
     
       2. An electrophotographic light-sensitive medium as in claim 1, wherein A of Formula (1) is a single chemical bond or a divalent group represented by Formula (2), (3), (4), (5), (6), or (7), ##STR61## wherein R 1  and R 2  may be the same or different, and each is a member selected from the group consisting of hydrogen, a halogen atom, a (C 1  -C 4 )-alkyl group, a (C 1  -C 4 )alkoxy group, and a nitro group, and R 3  is a member selected from the group consisting of hydrogen, a halogen atom, and a cyano group, and B and B' may be the same or different and each is a coupler represented by Formula (8), (9), (10) or (11) ##STR62## wherein ##STR63## is a naphthalene ring, an anthracene ring, a carbazole ring or a dibenzofuran ring, and Y is --CONR 4  R 5  or --COOR 5 , wherein R 4  is a member selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted phenyl group, and R 5  is a member selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted pyridyl group and a diphenylamino group, and R 6  is a member selected from the group consisting of a substituted or unsubstituted alkyl group and a substituted or unsubstituted phenyl group. 
     
     
       3. An electrophotographic light-sensitive medium as in claim 1, wherein A of Formula (1) is a divalent group represented by the following formula ##STR64## 
     
     
       4. An electrophotographic light-sensitive medium as in claim 2, or 3, wherein Couplers B and B' are the same. 
     
     
       5. An electrophotograpic light-sensitive medium as in claim 2, or 3, wherein A of Formula (1) is a single bond and Couplers B and B' are the same. 
     
     
       6. An electrophotographic light-sensitive medium as in claim 2, or 3, wherein A of Formula (1) is represented by Formula (6) and Couplers B and B' are the same. 
     
     
       7. An electrophotographic light-sensitive medium as in claim 1, wherein the dis-azo compound is represented by the structural formula ##STR65## 
     
     
       8. An electrophotographic light-sensitive medium as in claim 1, wherein the dis-azo compound is represented by the structural formula ##STR66## 
     
     
       9. A dis-azo compound represented by Formula (1) ##STR67## wherein A is selected from the group consisting of a single chemical bond, a divalent hydrocarbon group containing a conjugated double bond, a divalent hydrocarbon group containing a nitrogen atom in a conjugated double bond and a divalent heterocyclic group which may be condensed with a benzene ring or substituted and forms a conjugated double bond system in combination with the adjacent azomethine groups, and B and B', which may be the same or different, each represents a coupler having aromatic properties. 
     
     
       10. A dis-azo compound as in claim 9, wherein A of Formula (1) is a single chemical bond or a divalent group represented by Formula (2), (3), (4), (5), (6), or (7) ##STR68## wherein R 1  and R 2  may be the same or different, and each is a member selected from the froup consisting of hydrogen, a halogen atom, a (C 1  -C 4 )alkyl group, a (C 1  -C 4 )alkoxy group, and a nitro group, and R 3  is a member selected from the group consisting of hydrogen, a halogen atom, and a cyano group, and B and B' may be the same or different and each is a coupler represented by Formula (8), (9), (10), or (11) ##STR69## wherein ##STR70## is a naphthalene ring, an anthracene ring, a carbazole ring or a dibenzofuran ring, and Y is --CONR 4  R 5  or --COOR 5 , wherein R 4  is a member selected from the group consisting of hydrogen, a substituted or unsubstituted alkyl group, and a substituted or unsubstituted phenyl group, and R 5  is a member selected from the group consisting of a substituted or unsubstituted alkyl group, a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted pyridyl group and a diphenylamino group, and R 6  is a member selected from the group consisting of a substituted or unsubstituted alkyl group and a substituted or unsubstituted phenyl group. 
     
     
       11. A dis-azo compound as in claim 9, wherein A of Formula (1) is a divalent group represented by the following formula ##STR71## 
     
     
       12. A dis-azo compound as in claim 10 or 11, wherein Couplers B and B' are the same. 
     
     
       13. A dis-azo compound as in claim 10, or 11, wherein A of Formula (1) is a single bond and Couplers B and B' are the same. 
     
     
       14. A dis-azo compound as in claim 10, or 11, wherein A of Formula (1) is represented by Formula (6) and Couplers B and B' are the same. 
     
     
       15. A dis-azo compound as in claim 9, wherein the dis-azo compound is represented by the structural formula ##STR72## 
     
     
       16. A dis-azo compound as in claim 9, wherein the dis-azo compound is represented by the structural formula ##STR73##